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AdvancedGeo <br /> 05 September 2023 An Employee-Owned Company <br /> Project No. 09-0235 <br /> Page 3 of 3 <br /> initials. Soil encountered in the borings will be visually classified by an AGI staff member <br /> in general accordance with the Unified Soil Classification System (USCS). <br /> Soil sample duplicates will be field-screened for the presence of volatile organic <br /> compounds using an organic vapor meter (OVM) equipped with a photo-ionization <br /> detector (PID) pre-calibrated to isobutylene. Soil sample descriptions and OVM readings <br /> will be recorded on a log for each boring. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice <br /> and transported under chain-of-custody procedure to a California Environmental <br /> Laboratory Accreditation Program (ELAP)-certified laboratory for the following <br /> constituents: <br /> • Volatile organic compounds (VOCs) in accordance with Environmental Protection <br /> Agency (EPA) method 8260B. <br /> • Polycyclic aromatic hydrocarbons (PAHs) in accordance with EPA method 8270C. <br /> Laboratory reports for water analyses, testing methods, laboratory quality <br /> assurance/quality control (QA/QC) reports, and sample chain-of-custody documentation <br /> will be presented in a report with the findings and recommendations. <br /> 3.3. BORING ABANDONMENT <br /> All soil borings will be permanently sealed to prevent vertical migration of potential <br /> contaminants. Soil borings shall be abandoned by backfilling with cement grout from the <br /> total depth to surface grade. Borings advanced below the groundwater table will be <br /> abandoned with grout utilizing tremie procedures. The top three to six inches of the boring <br /> abandonments will be completed flush to surface grade with concrete. The EHD will be <br /> notified for grout inspection at least 48 hours prior to conducting grouting procedures. <br />